The circuit designing of data acquisition board , especially of the parallel communication interface is thoroughly analyzed and the protocol of communication between pc and the data acquisition board is defined 本文重點(diǎn)論述了數(shù)據(jù)采集板硬件電路的設(shè)計(jì),特別是并行通信接口電路的設(shè)計(jì),定義了上下位機(jī)相互間通信的協(xié)議。